eight vs eight-spot

eight and eight-spot both are nouns.

Word	Noun	Adjective	Verb	Adverb
eight	Yes	Yes	No	No
eight-spot	Yes	No	No	No

As nouns, eight and eight-spot are synonyms defined as:

eight and eight-spot: one of four playing cards in a deck with eight pips on the face

eight (noun)	eight-spot (noun)
one of four playing cards in a deck with eight pips on the face	one of four playing cards in a deck with eight pips on the face
the cardinal number that is the sum of seven and one

eight (adjective)	eight-spot (adjective)
being one more than seven